Figure 1: Fractured rib sign in a 59-year-old man after blunt trauma. (a, b) Contrast-enhanced chest MDCT (axial and coronal planes) shows left 10th-rib fracture abutting the diaphragm (fractured rib sign). The diaphragm appears intact on initial trauma CT. (c, d) Repeat chest MDCT (axial and coronal planes) 5 days later reveals new herniation of omental fat (arrows) into the left hemithorax due to subacute diaphragm rupture. Note discontinuity of the diaphragm (d).